Picker-check for looms



(No Model.) I I 2 Sheets-Sl 1eet 1.

- S. GREENWOOD.

PIOKBR 01150.1( FOR LOOMSQ No. 485,686. I Patented Nov. 8, 1892.

Wain eases. 'fizvento'r.

dad WWW v (No Model.) 2 Shets-Sheet 2.

s. GREENWOOD.

PIGKER CHECK FOR LOOMS. J 2 No. 485,686 Patented Now-8; 1892-.

Q4: nunms PETERS 1:0,, PHOTO-LITHQ, WASHINGTON, a. 0.,

A than STATES PATENT OFFICE.

SAMUEL GREENWOOD, OF' LOWELL, MASSACHUSETTS.

PlGKER-CHECK FOR LOONIS.

SPECIFICATION forming part of Letters Patent No. 485,686, dated November8, 1892.

Application filed November 17, 1891. Serial No. 412,157. (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL GREENWOOD, a sub ect of the Queen of GreatBritain, re-

siding at Lowell, in the county of Middle-sex;

in connection with the accompanying draw-.

ings, and then particularly pointed out and distinctly defined in theclaim at the close of this specification.

My invention has among its objects to simplify the construction of apicker-check on the order of that presented in my Letters Patentaforesaid, and thereby make it less costly to manufacture; to arrangethe parts of a picker-check more satisfactorily with respect to oneanother, so that the stresses, strains, and wear incident to its usewill be more regularly distributed throughout its parts and thedurability will be increased, and to render the devices for regulatingthe friction of the check more perfectly adjustable and less liable toderangement.

In the accompanying drawings, Figure 1 is a view in front elevation of aloom-lay having my invention applied thereto, the said view representingthe shuttle-box which is at one of the ends only of the lay with thoseportions of the usual protecting mechanism which are adjacent to theshuttle-box that is so shown. Fig. 2 is a view in cross-section on line2 2 of Fig. 3; and Fig. 3 is an inverted or bottom View of the lay,showing the swords or arms thereof and the picker-sticks in section.

The lay beam or sill is shown at A, the lay sword or arms at B B, thepicker-sticks are shown at F F, and at G G G are shown the spring andstraps, which are connected with the lower ends of the picker-sticks,the said spring G acting to move the upper ends of the picker-sticksoutwardly, as usual.

At S is shown the usual movable front or swell of the shuttle-box, whichis located at the right-hand side of the lay in Fig. 1; at S the usualfinger, which is carried by the ordinary protector-shaft (not shown) andcaused to bear by its upper free end against the front or-swell S by thespring S all as usual.

In my former invention, presented in thepatcut above mentioned, theoutward movement of the picker-sticks is checked by means of hooks oroffsets extending laterally into the paths of the said picker-sticksfrom blocks situated to one side of the plane of motion of thepicker-sticks, each block having a slot therethrough for the passage ofa screw having its threaded end entered into the under side of thelay-beam, the stem of the said screw below the block having thereon aleather or other packing-piecein contact with the under side of theblock, a plate partially covering the packing-piece, and a springlocated between the covering-plate and the head of the screw, thetension of the spring and the friction created in the movement of theblock being regulated by turning the screw. A leading disadvantage ofthis construction is the decided twisting or side stress or strain whichresults from the blows of the picker-sticks against thelaterally-extending offsets or hooks, this stress or strain racking thedevices, being destructive of the combined parts, and occasionin g anexcess of friction which cannot be controlled by the screws. Otherdisadvantages are the unsatisfactory working of the adj usting devicesand the liability of such devices to get out of order.

In accordance with my present invention I provide straps D and D, onefor each pickerstick. Each of these straps is doubled upon itself, asshown clearly in Fig. 3, so as to form aloop or bight, within which islocated the correspondingpicker-stick. Friction-clamps C C are attachedto the lay beam or sill in front and in rear, respectively, of the slotf, within which the picker-stick F works, and through these clamps arepassed the opposite ends of the strap D. Similar friction-clamps O C aresimilarly disposed with relation to the slot f, within which thepicker-stick F works, and through them are passed the .opposite ends ofthe strap D. The extremities of the straps D D have secured theretoloops d d and d 01 respectively, which screw onto the opposite ends ofthe rods d d. (Shown in Figs. land 3.) The .said rods 61 d are supported'by and slide through stands "E E in which are secured leather brushingsfor the purpose of reducing the wear of the rods. The construction ofthe frictionclamps is shown clearly in Fig. 2. Each clamp consists oftwo metal parts 0 c, which preferably are made of malleable iron.Between the upper portions of the parts 0 c is placed a piece of leather0 for the purpose of separating somewhat the said upper portions andgetting a more even pressure upon the leather strap D or D, which passesbetween the lower portions of the parts cc. Screwstc csecurethe clampsto the lay beam or sill. Those portions of the parts 0 c of a clampwhich depend belowthe lay-beam or lay-sill have placed between them thehorseshoe-piece of leather a, between the limbs of which is passed theportion of the strap D or D which is acted uponby that clamp, thesaidportion of the strap sliding between and in contact with the faces 0c of the said piece of leather 0 A screw 0 passes through part c and thepiece of leather 0 and istappedinto the part 0', so

that by tightening or loosening the said screw 0 the necessary frictionupon the straps may be obtained to check and arrest the motion of theshuttle.

The action of the described construction and combination of parts inchecking a shuttle is clearly apparent, and is as follows: As will beobserved in Fig. 1,.t-he spring G, which is connected with the lowerends of the pickersticks F F by the straps G G, tends tohold the upperends of the said picker-sticks separated as far as is practicable and tokeep the leather-straps D D andthe rods d d'taut. The length of thestraps D andD and their connections isnots'ufficient to permit both thepicker-sticks to be at the outer extremities of the slots ff at thesametime. In the drawings picker-stick F is shown at the outer extremity ofthe slot f. Therefore, when the picker-stickF is struck by the shuttleafter the flight of the latter across the loom from right to left inFig. 1 the said picker-stick is free to move a short distance to theleft. The force of the blow is overcome and the shuttle is checked andarrested by the resistance arising from the friction generated in themovement of the straps D D through the clamps C 0 (3 C as thepicker-stick F thus moves. This movement of the picker-stick F causesthe picker-stick Fto be drawn, through the described connections, awayfrom theouter end of slot f into position to receive the blow of theshuttle in the flight of the latter from leftitorright. "It willbe seenthat in this my present invention each outward movement of eitherpicker-stick under the impact of the shuttle is resisted by the frictioncreated by all four friction-clamps, and also that the strains occurringwhile the shuttle is being strap are'placed as nearly as possibleequidistant from the plane of movement of the picker-sticks, in order tobalance the strains most perfectly. In my present device the wearisverylight andis uniformly distributed.

In my former invention the adjustingscrews f f shown in my patentaforesaid were screwed intothe wooden substance of the lay beam orsilland the thread in the hole in the latter was easily worn out by theturning and reversing of the said screws. This defect is wholly obviatedin my present construction. The eye-shaped heads of the saidadjusting-screws render the screws liable to be bent or knocked out ofplace by an ac cidental blow, whereas the screws 0 neither project intothe-way nor are liable to injury.

The ordinary method of checking and arresting themotion of a shuttle bymeans of powerful binder-springs located in or adjacent to theshuttle-box causes excessive wear of the shuttle and requires a verypowerful blow of the picker-stick for the driving of the shuttle out ofone box and across the loom to the other box. By the use of a checkingdevice on the order of that shown the use of powerful binder-springs isrendered unnecessary and the shuttle may be driven with a blow ofreduced force.

I claim as my invention- The combination of the picker-sticks with theleather straps passing around the tops of the picker-sticks, means forconnecting together the corresponding endsof "thesaid straps, and theclamps engaging with the opposite sides or limbs on each. of the loopsof the said straps, substantially as described.

In witness whereof I have signed this specification, in thepresence oftwo attesting witnesses, this 6th day ofNovember, 1891.

SAMUEL GREENVOOD.

Witnesses:

SAML. G. STEPHENS, GEORGE VWPOORE.

